After I installed my TRE my 6th gear felt a little stronger, not alot but noticebly. I have buried my needle in 5th gear, without going to 6th gear the last time I ran my bike hard against a few buddies with modified R1's. Still haven't had the need to push it to the limit and use 6th since I installed it. But one big thing that I have noticed is that you can run each gear all the way out and it doesn't die off as soon as before. When pulling against by buddy's Busa I can hold out a little longer before switching in each gear.